Protogyny and protandry are the underlying mechanisms favouring allogamy in monoecious palms. |
Protandry in knobbed whelk may be opportunistic, and not every individual may be capable of it. |
At the extreme, true prolificacy leads to protogyny whereas normal maize shows protandry. |
The temporal aspects of stigma receptivity and pollen longevity were investigated in relation to protandry and breeding system. |
Under natural photoperiodic conditions protandry in hermaphrodite disc flowers of sunflower is determined by the different elongation rates of the style and filaments. |
Flowers are self-compatible, but spontaneous autogamy occurs very infrequently due to protandry and to the spatial separation of anthers and stigma. |